Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Audioalter - Your online audio toolkit. A collection of easy-to-use web tools for all your audio files
MMA - “MMA—Musical MIDI Accompaniment” is an accompaniment generator.
Transcribe - An online app that reduces the pain of converting audio & video to text. Saves thousands of hours every month for journalists, lawyers, students and professional transcriptionists all over the world, including researchers in Antarctica.
ChordPulse - ChordPulse is interactive software that’s designed to help you learn music on your instrument.
Tune Transcriber - Learn and transcribe music for free from your web browser (no install needed).